metamorphic
Unakite (polished/tumbled)
Unakite, an epidote-altered granite composed chiefly of epidote, pink potassium feldspar, and quartz
AI-generated identification · may be incorrectMottled green and pink, opaque, with a granular texture and vitreous-to-dull luster; component hardnesses are about 6–7 Mohs. The image shows a rounded polished piece; exact composition cannot be confirmed visually.
Identified More metamorphic →
Explore Unakite (polished/tumbled) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mottled green and pink, opaque, with a granular texture and vitreous-to-dull luster; component hardnesses are about 6–7 Mohs. The image shows a rounded polished piece; exact composition cannot be confirmed visually.
Formation & geological history
Forms when granite undergoes hydrothermal alteration, converting some feldspar to green epidote while pink feldspar and quartz remain. Its age depends on the source granite; classic Unaka Range material is associated with ancient Appalachian rocks.
Uses & applications
Used for beads, cabochons, carvings, decorative stone, and inexpensive collector specimens.
Geological facts
The name comes from the Unaka Mountains along the Tennessee–North Carolina border, where it was first described.
Field identification & locations
Look for its distinctive mottled pink-and-green pattern and granular, interlocking minerals; classic material comes from the southeastern United States, though similar rock occurs elsewhere.
More like this
